A world exists that's quite different from our own. There, a battle rages out of control. A battle between good and evil...Green and Tan. —Intro to Army Men: Sarge's Heroes
Army Men was a popular series of Video Games by the now defunct The 3DO Company, about a war among several factions of plastic Army Men. The game was inspired by the developers' childhood memories of playing with miniature Army Men. The series lasted from 1998 to 2003, when 3DO went bankrupt. Many fans of the series laud the initial games' more "family oriented" take on the shooter genre. After Army Men: Air Attack, the brand started suffering from lower quality sequels and spinoffs (let's not talk about a certain game starring Sarge's girlfriend). Since 3DO went under in 2003, various other companies have since tried to make games based on the Army Men brand.
Bottomless Magazines: Most of the games tend to give your starting weapon infinite ammo, sometimes with a drawback (the M16 in the PS1 Sarge's Heroes 2 will overheat when fired too much) and sometimes with an ammo-guzzling upgrade available (the BAR in the original two games, which trades the infinite ammo for a much higher rate of fire).
Sarge: Plastro! Why don't you drop that gun and face me like a man? Plastro: Because I'm the bad guy, that's why! ... Plastro: Burn it all, starting with [Bridgette's] blasted Blue homeland. Vikki: Plastro! How could you? Plastro: Well, somebody's not paying attention. I'm the bad guy!
Color-Coded for Your Convenience: Every faction across the series. The four most common are Green being good guys, Tan being evil, Gray being, well, gray (in some games they're allied with the Greens, in others they're against everyone), and Blue being spies, typically allied with the Tans.
Every Helicopter Is A Huey: The Huey is treated as the generic helicopter in most of the series. Air Tactics does move you into a Black Hawk by the 5th mission and then a Cobra by the final levels. Air Attack applies this to the player's side (Tan helicopters are almost universally Cobras instead), and has the player move on to a Chinook early on, then a Super Stallion, and finally an Apache as the Infinity+1 Sword.
Face-Heel Turn: Colonel Blintz in the RTS after quite literally losing his mind.
Freeze Ray: Tina Tomorrow's and the rest of the space valkyrie's weapons in Toys In Space, there's even a truck that fires freezing mortars.
Frickin' Laser Beams: The aliens in Toys In Space, Sarge can even find a laser rifle, an upgrade to the autorifle and vulcan gun.
Kill 'em All: Sarge's War. Every major character in the series except for Sarge himself is dead by the end of the game. However, it is implied that Lord Malice either re-built the characters and had the clones waiting in life pods at the end, or actually kidnapped them before hand and replaced them with clones purely for Sarge's benefit to make him suffer, and had the actual characters themselves locked in stasis in the life pods.
Kill It with Fire: Not surprisingly, the most damaging non-heavy weapon in every game is the flamethrower.
The Red Stapler: This game is based on generic one-colored army men plastic toys.
Rule of Funny: Hard to avoid when the whole game is about miniature toys trying to kill each other.
Air Attack, for example, has a level where one of your bases is being torn apart... by ants. And to dispatch them, you have to drop cherry bombs on their anthills. Another mission has as its first goal winching a 12 V battery to power a toy train loaded with Green supplies; the next mission is about chasing RC bomb cars. And to unlock the final chopper, you need to gather its construction pieces, which come in gunpla-like packaging.
Sequel Hook: The first Army Men game (and 3D, for that matter) ends with Sarge M.I.A. after discovering the portal that had led into the human world, opening up to where part of Army Men II takes place there.
Shout-Out - Pretty much a staple of the series later in it's run, both in level names and even villains.
It was doing it as far back as the second game, where one two part mission was just one big shout out to Apocalypse Now.
Solar-Powered Magnifying Glass: This appears as a super weapon in some games. Due to the fact that all units are either little plastic men or (rarely) bugs, it works fairly well.
Air Attack has one level where Plastro got himself a magnifying glass and uses it to wreck havoc on Green bases. Watch out for the sun beam!
The Many Deaths of You: The second game, Toys In Space and World War featured various failure cut-scenes, complete with "You Lose" in army stencil font. Many of these tend to be horrific, especially the hospital scene in the second game. It should be noted that it isn't actually Sarge in these cut-scenes but just a generic soldier (excluding the grave scene).